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20-01-2018
Mathematics

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The end points of the diameter of a
circle are at (1,2) and (7,-6). What is the circumference of the circle, to the nearest tenth of a unit

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gustanika gustanika

20-01-2018

Find the diameter of circle using pythagoras
d = √(Δx² + Δy²)
d = √((7-1)² + (-6-2)²)
d = √(6² + (-8)²)
d = √100
d = 10
The diameter is 10

Find the circumference
c = π × d
c = 3.14 × 10
c = 31.4

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